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Internal structure of a gel leading to NBA-ZSM-5 single crystals
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Kemiteknik. Department of Chemistry, Faculty of Science and Technology, San Simon University, Cochabamba, Bolivia.ORCID-id: 0000-0002-8637-0461
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Kemiteknik.ORCID-id: 0000-0003-1053-4623
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Kemiteknik.ORCID-id: 0000-0003-4582-0902
2018 (engelsk)Inngår i: Journal of porous materials, ISSN 1380-2224, E-ISSN 1573-4854, Vol. 25, nr 6, s. 1551-1559Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Porous gel structures are formed during the synthesis of the zeolite ZSM-5 due to the reaction between a source of aluminosilicate, sodium hydroxide, water and a structure directing agent, such as e.g. tetrapropylammonium (TPA) or n-butylamine (NBA). In the present work, the formation of the gel in a heterogeneous system leading to the crystallization of NBA-ZSM-5 zeolite from leached metakaolin was studied extensively. The solid and liquid phases obtained after separation were analyzed by inductively coupled plasma sector field mass spectrometry, dynamic light scattering, extreme high resolution-scanning electron microscopy, energy dispersive spectroscopy, high resolution-transmission electron microscopy, X-ray diffraction and nitrogen gas adsorption. The main gel phase formed after hydrothermal treatment exhibited a sponge-like structure resembling those forming in (Na, TPA)-ZSM-5-based systems. For the first time, the walls of the main gel were shown to be inhomogenous and to possess a biphasic internal structure consisting of a mesoporous skeleton of aluminosilicate nanoparticles embedded in a silicate-rich soluble matrix of soft matter. The data presented in this paper is of primary importance to understand the mechanism by which the gel is consumed and contributes to the growth process of the zeolite crystals.

sted, utgiver, år, opplag, sider
Springer, 2018. Vol. 25, nr 6, s. 1551-1559
Emneord [en]
ZSM-5, Zeolite, Heterogeneous system, Aluminosilicate gel, Microstructure
HSV kategori
Forskningsprogram
Kemisk teknologi
Identifikatorer
URN: urn:nbn:se:ltu:diva-67592DOI: 10.1007/s10934-018-0568-5ISI: 000447386800001Scopus ID: 2-s2.0-85041522121OAI: oai:DiVA.org:ltu-67592DiVA, id: diva2:1181823
Merknad

Validerad;2018;Nivå 2;2018-11-01 (svasva)

Tilgjengelig fra: 2018-02-09 Laget: 2018-02-09 Sist oppdatert: 2023-09-06bibliografisk kontrollert

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